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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Magnetics
Journal Basic Information
Journal DOI :
The Korean Magnetics Society
Editor in Chief :
Volume & Issues
Volume 13, Issue 4 - Dec 2008
Volume 13, Issue 3 - Sep 2008
Volume 13, Issue 2 - Jun 2008
Volume 13, Issue 1 - Mar 2008
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Studies of Effects of Current on Exchange-Bias: A Brief Review
Bass, J. ; Sharma, A. ; Wei, Z. ; Tsoi, M. ;
Journal of Magnetics, volume 13, issue 1, 2008, Pages 1~6
DOI : 10.4283/JMAG.2008.13.1.001
MacDonald and co-workers recently predicted that high current densities could affect the magnetic order of antiferromagnetic (AFM) multilayers, in ways similar to those that occur in ferromagnetic (F) multilayers, and that changes in AFM magnetic order can produce an antiferromagnetic Giant Magnetoresistance (AGMR). Four groups have now studied current-driven effects on exchange bias at F/AFM interfaces. In this paper, we first briefly review the main predictions by MacDonald and co-workers, and then the results of experiments on exchange bias that these predictions stimulated.
Magnetic Properties of Carbon Chains Doped with 4d Transition Metals
Jang, Y.R. ; Lee, J.I. ;
Journal of Magnetics, volume 13, issue 1, 2008, Pages 7~10
DOI : 10.4283/JMAG.2008.13.1.007
The structural and magnetic properties of functionalized carbon chains doped with 4d transition metals, such as Ru, Rh, and Pd, were investigated using the full-potential linearized augmented plane wave (FLAPW) method. The carbon nanowire doped with Ru exhibited a ferromagnetic ground state with a sizable magnetic moment, while those doped with Rh and Pd had nonmagnetic ground states. For the Ru-doped chain, the density of states at the Fermi level showed large spin polarization, which suggests that the doped nanowire could be used for spintronic applications.
New Macroscopic Ferrimagnets in the System Co-TbN
Kim, Tae-Wan ; Oh, Jung-Keun ;
Journal of Magnetics, volume 13, issue 1, 2008, Pages 11~18
DOI : 10.4283/JMAG.2008.13.1.011
This study examines a new macroscopic ferrimagnet, Co-TbN. This ferrimagnet, consisting of two metallic phases, Co and TbN, demonstrated the typical macroscopic ferrimagnet properties of a magnetic compensation point and a negative giant magnetoresistance (GMR). The Co-TbN system with 32% TbN composition showed 0.72% GMR in magnetic fields up to 8 kOe at room temperature and 9% GMR in 40 kOe at 250 K. In the Co-TbN system, GMR exhibited a different dependence on temperature from that of ordinary GMR materials whose negative magnetoresistance decreases with increasing temperature. In contrast to ordinary GMR materials whose negative magnetoresistance decreases with increasing temperature, the GMR effect in the Co-TbN system increased with increasing temperature, due to the increase of ferromagnetic alignment of the Co and TbN in the magnetic field caused by the decreased exchange coupling with increasing temperature.
Magnetic Properties of Transition Metal-implanted ZnO Nanotips Grown on Sapphire and Quartz
Raley, Jeremy A. ; Yeo, Yung-Kee ; Hengehold, Robert L. ; Ryu, Mee-Yi ; Lu, Yicheng ; Wu, Pan ;
Journal of Magnetics, volume 13, issue 1, 2008, Pages 19~22
DOI : 10.4283/JMAG.2008.13.1.019
ZnO nanotips, grown on c-
and quartz, were implanted variously with 200 keV Fe or Mn ions to a dose level of
. The magnetic properties of these samples were measured using a superconducting quantum interference device (SQUID) magnetometer. Fe-implanted ZnO nanotips grown on c-
showed a coercive field width of 209 Oe and a remanent field of 12% of the saturation magnetization (
) at 300K for a sample annealed at
for 20 minutes. The field-cooled and the zero-field-cooled magnetization measurements also showed evidence of ferromagnetism in this sample with an estimated Curie temperature of around 350 K. The Mn-implanted ZnO nanotips grown on c-
showed superparamagnetism resulting from the dominance of a spin-glass phase. The ZnO nanotips grown on quartz and implanted with Fe or Mn showed signs of ferromagnetism, but neither was consistent.
Characteristics of Mn
Te Compound Studied by Electron Magnetic Resonance and Other Experiments
Na, Sung-Ho ; Kim, Heung-Chul ; Park, Jung-Woo ; Kim, Jang-Whan ;
Journal of Magnetics, volume 13, issue 1, 2008, Pages 23~29
DOI : 10.4283/JMAG.2008.13.1.023
The magnetic and other physical characteristics of
have been investigated by electron magnetic resonance (EMR), X-ray diffraction (XRD) and other experiments.
is found to have corundum structure for manganese contents up to 10% and also to be ferromagnetic for temperatures below 80 K. While ferromagnetic resonance signal coexists with the usual paramagnetic resonance signal, invariance of the g-factor inferred from the electron paramagnetic resonance signals throughout all temperature ranges clearly confirms that the manganese ions are in the electronic 3d5 state. The temperature dependence of EMR line-width is the same as other diluted magnetic semiconductors. From the EMR signals relaxation times
compounds are estimated to be about
respectively and are found to vary slightly with temperature or composition change. Exchange narrowing of the EMR line-width becomes dominant for the sample in which the substitution ratio, x = 30%. For one sample, in which x = 0.5%, spin glass-like behavior is indicated by EMR signals for temperatures lower than 60 K. This behavior may authentic for samples within a certain range of x.
Detection of Magnetic Nanoparticles and Fe-hemoglobin inside Red Blood Cells by Using a Highly Sensitive Spin Valve Device
Park, Sang-Hyun ; Soh, Kwang-Sup ; Hwang, Do-Guwn ; Rhee, Jang-Roh ; Lee, Sang-Suk ;
Journal of Magnetics, volume 13, issue 1, 2008, Pages 30~33
DOI : 10.4283/JMAG.2008.13.1.030
A highly sensitive, giant magnetoresistance-spin valve (GMR-SV) biosensing device with high linearity and very low hysteresis was fabricated by photolithography. The detection of magnetic nanoparticles and Fe-hemoglobin inside red blood cells using the GMR-SV biosensing device was investigated. When a sensing current of 1 mA was applied to the current electrode in the patterned active devices with an area of
, the output signals were about 13.35 mV. The signal from even one drop of human blood and nanoparticles in distilled water was sufficient for their detection and analysis.
Development of Micro-size Search Coil Magnetometer for Magnetic Field Distribution Measurement
Ka, E.M. ; Son, De-Rac ;
Journal of Magnetics, volume 13, issue 1, 2008, Pages 34~36
DOI : 10.4283/JMAG.2008.13.1.034
For the measurement of the magnetic field distribution with high spatial resolution and high accuracy, the magnetic field sensing probe must be non-magnetic, but the MFM probe and sub-millimeter-meter size Hall probe use a ferromagnetic tip and block, respectively, to increase the sensitivity. To overcome this drawback, we developed a micro-size search coil magnetometer which consists of a single turn search coil, Terfenol-D actuator, scanning system, and control software. To reduce the noise generated by the stray ac magnetic field of the actuator driving coil, we employed an even function
-H magnetostriction curve and lock-in technique. Using the developed magnetometer, we were able to measure the magnetic field distribution with a magnetic field resolution of 1 mT and spatial resolution of
at a coil vibration frequency of 1.8 kHz.